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One thing about the title, its not `xdotool` that does the pause/unpause, the `xdotool` is used only to get PID of active application with -a option.

Same with -s option where you will select the target window with `xprop` command.

The pause/unpause is done by the `kill` command of course.

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Apropos of nothing, you can use xdotool for rudimentary gui macros like very simple game bots and such.

Your post made me think perhaps xkill had an option to send other signals than abort, but it doesn't appear to without modification.

I believe xkill doesn't send any signals at all. Rather it tells the x-server to destroy a window and close its connection with the program that opened the window. If programs die, it's only because they weren't expecting their connection to suddenly be closed, as most wouldn't.

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